I would lowkey love a mod that slaps in an Air Exchange chapter between Entanglement and Anticitizen One. Like, idk how you could fit it in story wise, maybe like Gordon gets pulled out of whatever temporal vortex he's in and he battles through the Air Ex before being teleported back to Kleiner's lab at the end. Regardless of story, I would love that addition.
Something I would like would be Lost Coast between Entanglement and Anticitizen One. Maybe Gordon getting caught in something similar to what happened in the teleporter in "A Red Letter Day".